First things first. Leave the dent alone if it is only .5 mm deep. Not worth fixing. A cats are lightly skinned boats, so they will surely dent if you smack em hard enough. as far as repairs go, I would not trust a normal fiberglass guy repairing them. Find out who repairs high tech dingys if you are going to do it. the gelcoat on an A is very thin and easy to sand through.
If you want to try a repair, first try heating the area gently with a heat gun. You may sucessfully make the foam core pop back to the original thickness. I have made several dents disapear by doing this.
good luck,
Eric
Careful with the heat...the foam will melt too. I know I've been showing a lot of pictures lately - but I've been through a lot of headache with this stuff. I had previously been working in some cold weather (40F) and using a heat lamp to keep any glasswork warm. We got a warm snap the next day and I walked away and left the heat lamp on a fresh repair - it was too close given the warm sunshine and overheated the foam resulting in a much larger repair afterwards.
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